Machine derived contents note: 1. Social hierarchies among the Baruya of New Guinea Maurice Godelier; 2. Two waves of African models in the New Guinea Highlands Andrew Strathern; 3. Production and inequality: perspectives from central New Guinea Nicholas Modjeska; 4. The Ipomoean revolution revisited: society and the sweet potato in the upper Wahgi valley Jack Golson; 5. Tribesmen or peasants? Andrew Strathern